<!DOCTYPE html>
<html>
  <link rel='stylesheet' type='text/css' href='style.css'>
  <style>
    [placeholder="bar"]::-moz-placeholder,
    [placeholder="foo"]::placeholder {
      text-align: center;
    }
  </style>
  <body>
    <input placeholder='foo'>
    <input placeholder='bar'>
  </body>
</html>
